Broaching attachment



Nov. 1, 1927. 1,647,201

R. H. SMICKLE BROACHING ATTACHMENT Filed March 3. 1926 I/ f/V' v 2 TORAJ, R R05/ onaNVEI'/ I Y* 5 K cu/ Hfs AT ORNEYk Patented Nov. 1, 192?.

TES`

#RAYMOND H. SMIOKLE, ori-BELVIDERE," NEW JERSEY, AssrGNoE TorNeEnsoLL-RAND COMPANY, O F JERSEY CITY, NEW JERSEY,

CORPORATION OE NEW'JERSEY. o

BROAOHING ATTACHMENT.

applicati@ mea March 3, i926. serial No. 91,965;

Thisinvent'ion relates to fluid actuated rock drills, butr moreparticularly to a broaching attachmentwhich may be substi-` tuted forthe ordinary front head of a fluid actuatedrock drill of thehainmertype.

rIh'e objects ofthis invention are to enable a flat rectangularbroachingtool to be held and guided in a rock drill in an improved andsimplified manner, and to. enable .the broaching tool tobe 4quicklyvinserted into Y the front head of the drill and removed therefrom. l" nOther objects will be in lpart Obvious Vand v in part/pointed outhereinafter.

' head D respectively.

The invention consists of the combination of elements, arrangementofparts .and features of construction substantially ashereinafter-described and V,more particularly pointed out in theappended claims and illustrated t in the accompanyingv drawings, inwhich- Figure l is an elevation partly in secti-on of the front end of arock drill equipped with an attachment constructed in accordance withthe practice of the invention,

Figure 2 is af sect'onal elevation taken through Figure 1 on the line2-2 looking in the direction of the arrows, and

'Figure S is a transverse view in .section taken through Figure 2 on theline-3 3 looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in arockdrillof which only a front portion of a cylinder A is shown. A bushing Binserted in the front end of .the cylinder A forms a head for thecylinder and also acts as a guide for the noseor extension C of t-hepiston (not shown) reciprocable inthe cylinder A.

In accordance with the present invention, an attachment or front head Dis supported by the cylinder: Aj and preferably secured thereto by meansof a pair of cushioned side bolts E which extend through lugs F and Grcarried by the cylinder A andthe front The bolts E are pro-- vided withsprings H. which bear against the lugs G of the front head D to holdsaid front head yieldably Within the cylinder A. ,f

The rearward portion of the `front head D is preferably of generallycylindrical forniation and is provided with a bore J which acts as aguide for'an anvil block K interposed between the piston nose C andabroaching tool L for transmitting the blows of the Vhammer piston to thebroaching tool.

The rearward portionof the bore J'is preferablyv enlarged somewhat forthe reception Iof a bushing O which forms a removable vguide for theextension C of the hammer piston'. A y

. The frontend of the front head D is preferably rectangular as at Pand'is provided with 'a rectangular recess Q having parallel walls andinto one side of which recess is a1'.- ranged a jaw R preferably held infixed position by'means of suitable screws S. The jaw R is'seated on afront end'wall Dof the front head D and in this instance is provided atits linnermost end with a projection portion T adapted to extend into agroove.

U formed .in the side of the broaching tool L near the rearward endthereof. Disposed on the opposite side of the recess' Q, is another jawV which, like thejaw R, is also provided with an inwardly extendingprojec tion- T near its rearward end toeXtend into a groove 1V formed onthe broaching'tool L opposite tothe groove U. j W y y In order that thebroaching ltool Lrnay be quickly released from the front head B, thejaw,V is adapted to be yactuated slidablyv on the wall D toward and awayfrom the breaching tool L. To obtain this slidable movement of the jawV, awedge-like` member lX is disposed in the recess Q, to

slide in a plane parallelrto the longitudinal axis of the-front head andto cooperate slidably with a. tapered surface Y of the jaw V. The wedgeX is provided in this instance with a T-slot Z which engages a yT-shapedprojection Zn formedlongitudinally ofy the jaw V on the tapered side Y.The wedge X is preferably considerablyvshorter than the jaw V so'thatit. will becapable of a. vwide range of movement in a longitudinaldirection in the recess Q. Any suitable means. may be yprovided forlocking the wedge X in placed position. In the present instance a bolt cis inserted 'throughk kthe wedge and lextends through a slot (l formedlongitudinally Vof the front head and carries on its outer end a theinsertion of the breaching tool L into said front head. The opening z.is preferably of ample width so that the jaws R and V and the wedgeX maypass freely therethrough in assembling or disassembling the D by whichit is supported. r

In Figure 2 the adjustable jaw V is shown in its tool engaging position.In this position of the jaw V, it will be noted that the guiding faces yand g engage the sides of the broaching tool, it being intended in thisposition of the jaw V that there be only sufi'icient clearance betweenthe jaw and the broaching tool to permit free reciprocation of saidbreaching tool. If, however, it be found desirable to provide greaterclearance between the guiding surfaces of the jaws in the broachingtool, the wedge X may be drawn slightly rearwardly in the rece-ss Q.Movement of the wedge in this direction will have-the effect ofwithdrawing the jaw V.

After the jaw V has been moved to the desired position, the nut e may betightened on the bolt c and the jaw will be held firmly in position.

To release the breaching toolL, the wedg X may be moved krearwardlyalong the tapered side Y of the jaw V until a space exceeding thethickness of the tool is formed between the projections 'l of the jaws,whereupon the breaching tool L may be removed from the front head. Afterthe jaw V has been moved to its releasing position, the nut e may betightened on the bolt c and the jaw V will remain in releasing positionreadyv for the insertion of another broaching tool.

By means of this invention the breaching tool may be quickly insertedinto the front head or removed therefrom in practically the same manneras a drill steel may be inserted in the ordinary type of front head.

The parts, in this instance, the jaws R and V, which serve as guides forthe broaching tool L may be readily and cheaply replaced and owing tothe fact that the jaw V is adjustable, any wear which may occur on thejaws may be quickly compensated for by merely advancing the jaw V in thedirection of the broaching tool.

I claim: l

l. The combination with a rock drill having a cylinder, of an attachmentadapted to be secured to the cylinder, said attachment having ayrectangular' recess, a jaw secured in fixed position in one side of therecess, and a second jaw adjustable in the opposite side of the recessto cooperate with the first said jaw for loosely guidinga Vbreachingtool and for retaining such broaching tool in the attachment, said jawsbeing supported by the front end of the attachment." ,Y

2. The combination with a rock drilllhaving a cylinder, of anattachmentadapted to be secured to the cylinder, saidattachment having a front endwallwith a rectangular recess, said recess having parallel walls, a jawsecured in fixed position in one side of the recess, said jaw beingsupported by the end wall, a second jaw in the opposite vside of therecess slidable on the end wall and means slidable longitudinally in theattachment for imparting transverse movement to the second said jaw.

3. The combination with av rock drill having a cylinder, of anattachment adapted to be secured to the cylinder, said attachment havinga recess near its front end, a jaw secured iixedly in one side of therecess to forni a guide for one side of a broaching tool adapted toreciprocate loosely in the attachment, a slidable jaw in the other sideof the recess to form a guide for the op' posite side of such breachingtool and having a tapered side, a wedge interlocked with the slidablejaw, said wedge being slidable in a plane parallel. to the longitudinalaxisl of the front head, and slidable on the tapered side foractuatin'gsaid slidable jaw transversely in the front head, and meansincluding a bolt and a nut .for lockingv the wedge and the slidable jawin placed position.

In testimony whereof I have signedthis specification.

RAYMOND H. SMCKLE.

